The Browser Insanity section asks the question: "What could they have been thinking?" because some of the dysfunctionality in browsers is mind boggling, amazing, and even jaw-dropping!
The Animation section will assist you with getting things to do something on the screen, which is one of the coolest parts of DHTML.
The Buttons and Menus section will help you with the navigational aspects of website design, especially buttons and menus.
Here's a few helpful links to get you started on your CSS journey: